Yuji Kajiyama, Hiroshi Okada, Kei Yagyu
We propose a new type of radiative seesaw model in which observed neutrino masses are generated through a three-loop level diagram in combination with tree-level type-II seesaw mechanism in a renormalizable theory. We introduce a Non-abelian flavor symmetry $T_7$ in order to constrain the form of Yukawa interactions and Higgs potential. In our model, the $T_7$ symmetry forbids the universal coupling of the Higgs boson and leptons so that the decays of the standard model like Higgs boson into electrons and muons are much suppessed compared to those into tauons, which is in favor of the LHC results. We show a benchmark point that is consistent with the current experimental data from such as LHC, and multi-muon final states are key signatures of our model.
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http://arxiv.org/abs/1307.0480
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